(+3又2/15)*(-1又12/13)-(+1又13/15)*4又12/13-3*(-1又13/15),过程加结果,
问题描述:
(+3又2/15)*(-1又12/13)-(+1又13/15)*4又12/13-3*(-1又13/15),过程加结果,
答
(+3又2/15)*(-1又12/13)-(+1又13/15)*4又12/13-3*(-1又13/15)
=-47/15x25/13-28/15x64/13+3x28/15
=-47/15x25/13+28/15x(3-64/13)
=-47/15x25/13-28/15x25/13
=(-47/15-28/15)x25/13
=-5x25/13
=-125/13